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)8002,8002,8020,8022 ( ‫أنموذج ( ب ) الخاص بالبحوث لألعوام‬
University of Baghdad
College Name
Institute of laser for postgraduate studies
Biomedical application department
Full Name as written
in Passport
[email protected]
Assistant Lecturer
Research Title
Shared or Single
Published Journal title
Volume Number
Assistant Professor
Comparative Histological Study of Dentinopulpal Responses in Class I Cavity Treated
by Er: YAG Laser and Conventional Cavity Preparations: An in Vivo Trial
Shared name
Maha W. Al-Gazali (1) Ali S. Mahmood (2)
Lehadh M. Al-Azzawi (2) and Rayid K. Jarjess (3)
Iraqi journal of laser
Vol.9,No. 1
The purpose of this study is to investigate the histopathological response of
dentinopulpal response of human teeth to the Er: YAG laser cavity preparation in
comparison with the conventional class I cavity preparation. Thirty five sound human
upper and lower first premolar teeth which were needed to be extracted for
orthodontic purposes were used in the study. Regarding to the method of cavity
preparation, the teeth were grouped into three groups; Group1; Control group which
consists of seven sound teeth without cavity preparation, Group2; Conventional
cavity preparation group and group 3; Er: YAG laser cavity preparation group. Each of
Group2 and3 consists of fourteen teeth that are subdivided into: A. 7teeth that
extracted after two days after cavity preparation and B. 7 teeth that extracted after
twenty-one days after cavity preparation. Er: YAG Laser device emits radiation at
wavelength of 2940 nm in the infrared region. The laser irradiation was performed in
a non-contact mode with a focused beam of (energy density of 155985.96 mJ /cm 2,
energy of 600 mJ and a PRRs of 6 Hz for enamel preparation) and (energy
density=64994.151 mJ /cm2, energy = 250 mJ and a PRRs=4 Hz for dentin
preparation) with a spot diameter of 0.7mm at 12-15 mm distance and at right angle
to the tooth surface as possible. The histopathological results of the cavities prepared
by Er: YAG Laser revealed the early proliferation of the odontoblasts in the
odontoblastic layer of the coronal part of the pulp which led to the early formation of
the reparative dentin in comparison to those prepared by conventional method. It
can be concluded that the use of the Er: YAG laser in class I cavity preparation has
proved to be an efficient technique in comparison to the conventional cavity